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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e060632483abcf065e523aaf04a70d0b87343da7978fbe5251c9c25823ccc36' 
  AND token = '3FTr+Z2mMB3PE35PQjef1eJFhdh30b/kLCF6F3SYre0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}